Mercury - High Capacity Water-Separating Fuel Filter Kit Fuel System 35-8M0082290. Overview. A lot of fuel problems-hesitation, weak hole-shot, rough idle-come down to dirty fuel or water making its way toward the engine. This high-capacity filter kit is the kind of setup boat mechanics like to install when a boat runs multiple engines or just pulls fuel hard. It includes the vessel-mounted filter head and a 10-micron, high-media filter that can keep up with big fuel demands. If you've ever had